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7-13. GSM Transmitter
TX ON (5Level)
Yes
U100 Pin8
>= 20dBm
No
U100 pin11
>= 18dBm
No
PAM100 pin10
>= 18dBm
No
PAM100 pin9
<= -11dBm
No
U102 pin38
<= -15dBm
No
U102 pin 6,7,8,9
>= 1V
No
Check U200
END
Yes
Resolder RFS100, C102,C103
Yes
Yes
Resolder L123, L122, C148
Yes
Yes
Resolder L111, C142, F103,
Yes
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Check U100
pin10 = H (2.68V)
pin12 = L
No
Check PAM100
pin 3,4,5,6,7 OK?
No
L124, R109, C126
Check U102
pin23, 26, 31
>=2.7V
No
7-23
Flow Chart of Troubleshooting
Yes
Change or Resolder U100
Check ANT Switch
control circuit
Yes
Resolder or Change PAM100
Check +VBAT or PAM
control signal
Yes
Resolder U102
Check & Resolder RFLO
signal, RF13MHz,
RF PSU Part
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